Zebrafish regrow fins using multiple cell types, not identical stem cells
What does it take to regenerate a limb? Biologists have long thought that organ regeneration in animals like zebrafish and salamanders involved stem cells that can generate any tissue in the body. But new research from Washington University School of Medicine in St. Louis has shown that the individual cells in a regenerating limb retain their original identities and only give rise to more of their own kind.